Annales Botanici Fennici 35: 229-232
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Ann. Bot. Fennici 35: 229–232 ISSN 0003-3847 Helsinki 20 November 1998 © Finnish Zoological and Botanical Publishing Board 1998 Notes on the taxonomy and distribution of Cololejeunea platyneura (Hepaticae, Lejeuneaceae) Rui-Liang Zhu & May Ling So Zhu, R.-L. & So, M. L., Biology Department, Hong Kong Baptist University, 224 Wa- terloo Road, Hong Kong, China Received 31 March 1998, accepted 24 May 1998 Cololejeunea astyla Mizut., previously known only from North Borneo, is proposed as a synonym of C. platyneura (Spruce) A. Evans, which was known from Africa, South America and Vietnam and is here reported for the first time for China (Yunnan). The taxonomy of C. platyneura and related species is discussed and a distribution map of it is provided. Key words: Borneo, China, Cololejeunea astyla, C. platyneura, distribution, epiphyllous liverworts, Lejeuneaceae Cololejeunea platyneura (Spruce) A. Evans, an Cololejeunea platyneura (Spruce) A. Evans epiphyllous hepatic, was first described from Bra- (Fig. 1) zil by Spruce (1884) as Lejeunea platyneura Spruce. Stephani (1916) described an African spe- Mem. Torrey Bot. Club. 8: 172. 1902. — Lejeunea platy- cies, Physocolea vittata Steph., which was rejected neura Spruce, Trans. Proc. Bot. Soc. Edinburgh 15: 299. by Jones (1954) as a nomen confusum. Jones in- 1884. — Type: Brazil. Rio Negro, S. Gabriel, Spruce L 516 (holotype, MANCH-18835!). troduced a new name, Cololejeunea usambarica Physocolea vittata Steph., Spec. Hepat. 5: 873.1916. E. W. Jones. Pócs (1992) reported Cololejeunea — Type: Tanzania. Usambara or., ad flumen Siga, in Hort. bichiana Tix. for Madagascar and the Mascarene Botan. Amani, 600 m. alt., P. Joshi, Herb. E. Levier no. 4530 Islands. Tixier (1992) reduced C. bichiana Tix. (holotype, G-17499!). and the African C. usambarica to synonyms of Cololejeunea usambarica E. W. Jones, Trans. Brit. Bryol. C. platyneura. In Asia this species was known Soc. 2: 434. 1954, nom. illeg. — Type: Tanzania. Usambara only from Vietnam (Tixier 1992, 1994). In the or., ad flumen Siga, in Hort. Botan. Amani, 600 m alt., P. Joshi, course of our recent studies on epiphyllous Herb. E. Levier no. 4530 (holotype, G-17499!). Cololejeunea astyla Mizut., J. Hattori Bot. Lab. 29: 156. hepatics, we found that C. astyla Mizut. of North 1966, syn. nov. — Type: Malaysia. Sabah, Kinabalu area, Borneo is conspecific with C. platyneura. We re- between Sosopodon and S. Kelinggen, 1 350–1 400 m, port it also for Yunnan, China, which is its north- 26.V.1963, M. Mizutani 253895 (holotype, NICH!). ernmost locality. Cololejeunea bichiana Tixier, Ann. Hist.-Nat. Mus. Nat. 230 Zhu & So • ANN. BOT. FENNICI 35 (1998) Fig. 1. Cololejeunea platyneura (Spruce) A. Evans (A, C–H, M and N from Spruce L 516, MANCH; B, J–L and O from Zhu 88020b, HSNU; I from Mizutani 253895, NICH). — A and B: Portion of plant, ventral view. — C: Keel margin of perianth. — D–F: Apices of leaf lobules. — G–K: Leaves, ventral view. — L and M: Basal cells of leaf lobe (vitta-like area). — N and O: Female inflorescence, ventral view. — Scales: X = 0.3 mm (A, B, G– K, N and O), E = 0.1 mm (C–F, L and M). Hungarici 66: 94. 1974. — Type: Vietnam. Ninh Binh, Parc As mentioned by Jones (1954), there are three national de Cuc Phuong, épiphylle dans les forêt Bông, specimens under the name Cololejeunea vittata 21.XII.1965, T. Pócs, Nguyên Bich & Trân Ninh 3064 (ho- in Stephani’s herbarium. The first one is from New lotype PC, not available on loan). Guinea (leg. Nyman), and it clearly belongs to Co- Illustrations: Jones 1954: 432 (fig. 10a–f as Cololejeu- nea usambarica); Mizutani 1966: 155 (fig. 1: 10–17 as C. as- lolejeunea peraffinis (Schiffn.) Schiffn. The sec- tyla); Pócs 1975: figs. 44–58, 60–63 as C. usambarica; Ti- ond (Brunnthaler 25 from Usambara, Tanzania) xier 1974: fig. 8 as C. bichiana; Tixier 1985: 213, fig. 13 as contains scanty material of C. obliqua (Nees & C. usambarica; Tixier 1992: figs. 2–4. Mont.) Schiffn., and the third (Herb. E. Levier ANN. BOT. FENNICI 35 (1998) • Taxonomy and distribution of Cololejeunea platyneura 231 4530, G-17499) is the holotype of Physocolea vit- 1. Dorsal protrusion of leaf lobe small and low; median tata. Jones (1954) erroneously introduced a new cells of leaf lobe 17–30 × 10–20 µm; perianth wall cells name Cololejeunea usambarica, based on that with low papillae; leaves slightly falcate; ocellus-like basal cells absent; epiphyllous ............ C. platyneura specimen. Therefore, C. usambarica E. W. Jones 1. Dorsal protrusion of leaf lobe large and high; median is an illegitimate name. cells of leaf lobe 8–18 × 6–10 µm; perianth wall cells Cololejeunea platyneura is well characterized with high papillae; leaves usually strongly falcate; ocel- and easily recognized by (1) absence of a stylus, lus-like basal cells usually present (1 or 2 per leaf lobe); (2) presence of a vitta-like area in the leaf lobe, epiphyllous or epiphloeodic ..................... C. tenella (3) a hyaline papilla which is situated on the proxi- As pointed out by Pócs (1993), Cololejeunea mal side of the first tooth, (4) small and low pa- magillii Pócs, which is known from the Comoro pillae on the dorsal side of the leaf lobe, (5) large Islands, is similar to C. platyneura. However, the leaf cells usually with distinct trigones, (6) an epi- former differs in its hyaline papilla which is situ- phyllous habitat, (7) a free margin consisting of ated on the inner surface of base of the first tooth one row of 4–6 elongated cells, and (8) usually of the leaf lobule. 16–18-celled gemmae. Pócs (1975) compared Cololejeunea platyneu- Pócs (1975) described Cololejeunea platyneu- ra with C. elegans Steph. The latter lacks a vitta- ra in detail as C. usambarica, based on African like area, has large papillae on dorsal side of leaf material. The species shows slight variations in lobe, a 1-celled stylus, a dental hyaline papilla, several features. In the type material from Brazil, and large leaf lobules (with 7–16 free marginal the keel margins of the perianth are more or less cells). Tixier’s (1985) illustration of C. elegans serrulate or papillose (Fig. 1C and N). However, may not be correct, because a distinct vitta-like they are nearly entire in Vietnamese and Chinese area was illustrated. material as well as in most specimens from Af- Pócs (1975) placed Cololejeunea platyneura rica. The leaf shape also varies. Usually the leaves in the subgenus Taeniolejeunea (Zwickel) Bene- are more or less falcate and rounded at the apex, dix. However, we think it belongs to the subgenus but in Chinese specimens the ventral margin is Cololejeunea because of its large leaf cells, in- mostly straight (Fig. 1B, J and K). The first tooth flated perianths with 4–5 keels, and absence of a of the leaf lobule varies from one to two cells. It stylus and true ocelli. usually points towards the apex of leaf lobe (Fig. Cololejeunea platyneura is a pantropical epi- 1E and F), but sometimes also towards the stem phyllous species, and the total range is shown in apex, as shown in Fig. 1D. A vitta-like area is Fig. 2. Yanjiang (ca. 25°N, 98°E), China is the developed more strongly in Malaysian, Brazilian northernmost locality for this species. Though and African material than in Chinese material (Fig. widely distributed in Africa (Grolle 1995, Wiggin- 1M). The Chinese plants have numerous perianths. ton et al. 1996), it seems to be rare in Asia. Only The spores in the Chinese material are irregular the two Chinese specimens cited below were avail- in shape, usually rectangular, 22–41 × 20–22 µm, minutely papillose under light microscope, but able for examination. densely beset with verruca-like processes with- Selected specimens examined. — Brazil. Bombonna, out rosettes under scanning electron microscope. Spruce s.n. (MANCH-18836). China. Yunnan, Daweishan C. astyla is identical with C. platyneura except Nature Reserve, 1 800 m, Zhu 88020b (HSNU); Yingjiang for the relatively smaller leaf lobules (Fig. 1I). County, Tongbiguan Commune, Wang 82477 (HSNU, PC). Cololejeunea platyneura is closely related to Vietnam. Ninh Binh, parc de Cuc Phuong, 400 m, C. tenella Benedix, which is known from Aus- 18.XII.1965, T. Pócs & N. Bich 3040 (labeled as type of Cololejeunea bichiana, PC). Zaire. Prov. Kivu. Kahuzi- tralia, Cambodia, China, Indonesia, Malaysia, Sri Biega Nat. Park, Mt. Biega, secondary montane forest domi- Lanka and Vietnam (Benedix 1953, Tixier 1985, nated by Loc. 139 Macaranga, 2 250–2 270 m alt., E. Fischer Thiers 1988). They share the same habit, apical 8504 (PC). structure of leaf lobule, position of hyaline pa- Additional specimens examined. — Cololejeunea tenel- pilla and basal cells of leaf lobe which are usually la: Cambodia, Sré Ambel, epiphylle en forêt dégradée, elongated. However, they can be separated by the 19.IV.1968, Tixier 3713-3714-3715 (FH). China. Anhui, following key: Qimen, 400 m, Zhao 12 (HSNU). Fujian, Nanping, Gao 232 Zhu & So • ANN. BOT. FENNICI 35 (1998) Fig. 2. Distribution of Cololejeunea platyneura (Spruce) A. Evans. Modified from Tixier (1994). 25449 (HSNU, IFP). Hainan, Wuzhishan, 850 m, Li 4494 from Sabah (North Borneo). — J. Hattori Bot. Lab. 29: (HSNU, SHM). Yunnan. Daweishan Nature Reserve, 1 800 m, 153–170. Zhu 88017 (HSNU). Zhejiang, Baishanzu Nature Reserve, Pócs, T. 1975: New or little known epiphyllous liverworts 710 m, Zhu 90679 (HSNU). Indonesia. Java, G. Salak, 800 m, I. Cololejeunea from tropical Africa. — Acta Bot. Acad. Schiffner 3328 (holotype, JE). Sri Lanka. Galle dist., ca. Sci. Hungarici 21: 353–375. 1 500 m, 19. VIII. 1977, Onraedt 77.L.4723 (Herb. Onraedt). Pócs, T. 1992: Correlation between the tropical African and — Cololejeunea elegans: Cameroon.